Furnace humidifier



March 2 1926. 1,575,379

0. P. NYSTROM FURNACE HUMI DIFI ER Filed July 21. 1924 3 Sheets-Sheet 115 Miss Fro m March 2 1926.

o. P. NYSTROM FURNACE HUMIDIFIER Filed July 1 1924 3 Sheets-Sheet 2hwenfor n m M Nun a March 2 1926.

.0. P. NYSTROM FURNACE HUMIDIFIER Filed July 21. 1924 s sheets-sheet 5 WV0 ww M wwu w a W ij M m P m/ 3/ Patented Mar. 2, I926.

UNITED STATES 1,575,379 PATENT OFFICE.

OSCAR P. NYSTROM, OF HOLLAND, MICHIGAN, ASSIGNOR 'IC HOLLAND FURNACECOMPANY, OF HOLLAND, MICHIGAN, A CORPORATION OF MICHIGAN.

FURNACE nournrrinn.

Application field July 21, 1924. Serial No. 727,136.

To all whom it may concern:

Be it known that I, OSCAR I. Nrsrnom, a citizen of the United States ofAmerica,

exact description-of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to furnaces and is especially directed to a novelconstructionof humidifier for the evaporation of water in the airheating space enclosed between the outer casing and thefire pot,combustion chamber and radiator of the furnace. it is a primary objectand purpose of my invention-to provide a humidifier in which a. largeevaporating surface is furnished and in which a continuous supply ofwater to the humidifier construction is provided so that the same neverbecomes dry. A further object of the invention is to provide a drain forexcess of water supplied to the humidifier that such excess may becarried and delivered to the ash pit, dampening the ashes and therebyeliminating dust, and at the same time supplying a certain amount ofmoisture in the air which goes to the burning fuel, this being adesirable feature in furnaces. Further, it is an object and purpose ofthe invention to constructthe water holding parts of the humidifier asan integral portion of the ash pit casting with substantially noincrease in the cost of manufacture of such casting. p

The construction by means of which these results and others not atpresent specifically stated are attained is shown in the accompanyingdrawings in which,

Fig. l is a central vertical section, from front to rear, through afurnace equipped with my invention.

Fig. 1* is a fragmentary enlarged detail in vertical section of thewater holding part ofthe humidifier construction. 2 is a horizontalsection taken substantially on the plane of line 2-2 of Fig. 1. Fig. 3is a fragmentary front elevation of the furnace equipped withtheinvention and showing the means of water supply.

therefor, an

' Fig. 4 is a fragmentary enlarged vertical sectionthrough the front ofthe furnace her is integrally formed including and through the trough orspout which car ries the water to the water holding portion of thehumidifier construction.

Fig. 5 is a vertical elevation partly in section of a furnace showing,modified arrangement of the humidifierembodying this invention and,-

Fig. 6 is a sectional plan with parts broken away from the line 6-6 ofFig. 5.

Like reference characters refer to like ings. I

As shown in Fig. 1', the furnace includes the usual ash pit l a fire potincluding two superimposed sections 2 and 3 located above the ash pitand with agrate 2 between the fire pot and ash pit, a combustion chamberAt located above the section 3, and a radiator dome 5 and a radiator 6at the upper end of the combustion chamber 4 all enclosed by burningmember of the furnace and has hotair pipes 8 at its upper end to carryheated air to the various rooms to which hot air. is to be supplied bythe furnace. At the front the casing is cut away and replaced by acasting 7. The combustion chamber casting 4 has a forwardly extendinginlet 9 leading to one of the front castings 7 in which a door 10 ismounted which may be opened for the passage of fuel to the fire pot. Theash pit has a bottom. 11 and is also formed with integral forwardlyextending sides 12 at the front which are spaced apart and extend to thelower cast ing? in which the usual door 13 is mount ed carrying theusual draft member, the door being opened-when desired for the removalof ashes.

The construction so far described is old and well known. At the upperside and at the front of the ash it construction between the forwardlyextending sides 12 a top 11:11ama a onzontal section 14 at the frontwhich is then extended downwardly and to the rear at an incline asindicated at 15 with two spaced apart upper extending sides 16 castintegral with the top member, as shown, and with transverse or crossribs 17, 18 and 19 located between the sides 16 whereby threecoinpartments are made adapted to hold water.

c5 parts the different figures of the draw- Hit ' side of the part 14and is in a higher plane nearest the fire pot. It'is onl holdingcompartments are thus made and r it is designed that water shallbe'received in the compartment in front of the rib 17 until it is full,thenceflow over this rib into the nextcompartment and when it is fullflow over the rib 18 into the compartment water in the'last compartmentas reached the level of the opening 20 that any excess is conducted downthe guide 21 to drop into 2hthe ash pit. A. very large evaporatingsurface is made and a large quantity of water vapor is given off ,witha. humidifier construction made as described: I

A trough orspout 22 passes through an opening in the lower front casting'2' at its inner end being located directly above the water holdingcompartment in front of the cross rib 17. The hot water coil for thefurnace is provided with a supply pi e 23 which connects with the coil24 whi e an outlet pipe 25 connects with the coil in the usual manner.In the supplypipe 23 a T 26 water coil 'supply pipe. It may be obtained.

, able is interposed from which a plpe 27 of small diameter depends, atits lower end being equi ped with a pet-cock 28 with a valve whic may bemanually operated through handle'29 shown. .This pet-cock is locateddirectly over the outer end of the trough or spent 22 and water dropsinto the trough in greater or less amount according to the degree thatthe valve is opened. This, after a little experiment and trial, may beso that the proper amount of water will be furnished.

It is not necessary that the water to supply a humidifier be taken fromthe hot from any source." It is almost universal practice to provide ahot water coil with supply pipe in the position described and it is veryconvenient to obtain water for the humidifier from this location.

By using this. water pan which has previously been commonly used isomitted and the opening usu-' ally provided for it is covered by aremovplate 30 removal of which spectlon or cleaning of the hum difier;

The construction illustrated m Figs. 5 and 6 shows the .gpossibility oflocating the humidifier in positions than uponthe when the the waterholding of humidifier the rmits intop of the ash pit section, such forexample as upon-the top of the feed door section 9.

This construction may be made almost An-outlet pipe 36 communicatingwith i the upper humidifier may also be provided throug which a surplusamount of water will escape and drain into troughs 37 and 38 whichsurround the furnace beneath it. The trough 37 has a drain pipe 39leading tothe trough 38 and the trough 38 has a drain pipe 40lea-ding'to the lower humidiier.

It is not probable that all of the humidifier pans and troughs will benecessary to produce/the requisite amount of moisture in any singleinstallation and those not necessary may be eliminated.

While the invention has, been .described and shown as formed as aniiltegral part of either the ash pit casting or the feed section castingit is not necessarily so made. When the humidifier is embodied in newly.constructed furnaces-it is expedient to make it as shown. butwhen it isdesired to apply the device-is made separately the guide 21 may beextended through a hole cut through the top of the ash pit-section;

The construction is easily manufactured,

compartments formed on theash pit casting and with practically noaddition in cost of manufacture. The hot water coil for furnaces is aregular and almost universal installation an being all 7 that isrequired additional is the. trough or spout 22, the T 26 and the partsconnected thereto extending toward the trough. "The.

water holding compartments are full at all times, a large evaporatingsurface is provided and the quantity of water held in the smalldiflerent compartments is relativel so that the evaporation of the wateris rapid the same being quickly heatedwitha resultant'increase 1nevaporation. As a rule the amount of moisture supplied with'warm'airifurnaces is much too small but with my in-- ventionthe moisture suppliedto the warm 1 air going to the roomso the house is greatly increased,'in practice at least six-fold. And at the same time an assurance 1s.had

that'the water holding com artments 0f the of water and.

humidifier shall always be eliminated permitting air to circulate freelyaround the space formerly occupied by the water pan which adds to theetliciency and heating capacity of the furnace.

The invention is defined in the a 'lpended claims and is to beconsidered comprehensive ofall forms of structure coming within theirscope.

I claim: I

1. In a furnace, an ash pit casting and a fire pot casting located abovethe ash pit casting, said ash pit casting at one sidehaving outwardlyextending spaced apart sides and a top disposed between the upper edgesof the sides, said top including an outer horizontal section and anintegral downwardly and inwardly inclined section, spaced apart sidescast with and extending upwardly from said top, and a plurality ofspaced apart cross ribs cast with the inclined section of the top andwith said last mentioned sides, said cross ribs, excepting the innermostcross rib having upper edges located in planes lower than the nextadjacent outer cross rib, substantially as and for the purposesdescribed.

2. A construction containing the elements in combination as defined inclaim 1, said top adjacent the next to the innermost cross rib having anopening-made therethrough, and a downwardly and inwardly inclined guide,rib cast integral with the top on the under side thereof and extendingfrom said opening downwardly and inwardly.

3. A construction containing the elements in combination defined inclaim 1, combined with a casing and enclosing the furnace,-and

a water carrying trough mounted on and extendin through the casinghaving its inner end isposed over the said top at a point in front ofthe front outermost cross rib, and its outer end outside of said casing.

4. A construction containing the elements in combination defined inclaim 1, combined with a casing enclosing the furnace, a water carryingtrough mounted on and extending through the casing and having its innerend disposed over said topat a point in front of the front outermostcross rib, and its outer end outside of the casing, a water carryingpipe located over the front end of the trough, and a manually operablevelveteecured to the pipe for controlling the passage of water therefromto the trough.

5. In a furnace, an ash pit casting and a fire pot casting located abovethe same, a casing enclosing the said castings, and a water holdindevice located directly in front of the re pot and integrally formedwith said ash pit casting comprising a downwardly and inwardly inclinedbottom, spaced apart upwardly projecting sides, and a 'plu rality ofspaced apart cross ribs extending between the sides, said cross ribs,excepting the innermost having their upper edges lo,- cated in plane-slower than next adjacent t'ront cross rib, substantially as described.

6. In a furnace, an enclosed ash pit, a fire pot located above the ashpit, and a combustion chamber and radiator located in superim 'iosedrelation over thefire pot, a water coil extendlng into the combustlonchamber from outside of the furnace, a

water holding device located directly in front of the the pot, a trough,a casing surrounding the ash pit, fire pot, combustion chamber andradiator, said trough extending therethrough, and means for supplyingwater continuously from the water coil to said trough for .transferrencethereby to the water holding device.

7. In a furnace, including an ash pit having a forwardly projectingportion, fire pot, combustion chamber and radiator with an enclosingcasing around the same, a water holding receptacle located directlyabove said forwardly projecting portion of the ash it and having adownwardly and inwardly 1nclined bottom, sides, and cross ribs dividingthe receptacle into compartments located in different horizontal planes,the cross ribs being of a height that water flows over the same from ahigher to the next lower com partment when full; said lowermost com-.

partment being formed with a drain opening at its highest point in itsbottom, and means to continuously supply a predetermined amount of waterto the highest compartment of the'receptacle.

8. A furnace ash pit comprising a casting having substantially verticalwalls continuously around the ash pit except at one side thereof, saidwalls being extended-outwardly inspaced apart parallel verticalrelation, :1 top disposed between the upper edges of said outwardlyextended portions of said walls and including a section extendingdownwardly and inwardly at an angle to the horizontal, spaced apartupwardly projecting sides cast integral with said top, and a pluralityof spaced apart cross ribs disposed ,between said last mentioned sides,said cross ribs, excepting the innermost rib having upper edges locatedin planes lower than the edge of the next adjacent outer cross rib. v

9. A furnace ash pit comprising a casting having substantially verticalwalls continuously around the ash pit except at one side thereof, saidwalls being extended outwardly inspaced apart parallel vertical relationat said side, a top disposed between the upper edges of said outwardlyextending portions of said walls and including a section exsaid top, anda plurality of spaced apart cross ribs disposed between said lastmentioned sides, said cro'ss ribs, except the innermost rib, havingupper edges located in planes lower than the edge of the next ad-.jacent outer cross rib, and said bottom having an opening therethrougliclosely adjacent the next to the innermost cross rib and between thesame and the innermost cross rib, substantially as and for the purposesdescribed.

10. A furnace humidifier comprising a tacle, means for supplying waterto the receptacle above the uppermost rib and means for draining waterfrom the receptacle near its lower side and for conveying said water tothe ash pit of the furnace. p In testimony whereof I afiix my signature.

OSCAR B. NYSTROM.

